Certificate Signature is not working

Question

Hi,

I'm trying to sign a PDF with an official certificate from the FNMT (the official certificate issuer in Spain). I can import it into Windows 10, validate it, and use it to sign in other applications without any problems, but when I try to sign it in Adobe Acrobat Pro, the option to use a certificate doesn't appear.

I can use the personal certificates he created, but the certificates from the Windows certificate store don't appear.

If I try to sign by setting up a new digital ID, I can select the certificate, enter the password, and add it.

But when I click the Next button, the "Sign with a digital ID" option appears again with the same two digital IDs as before, and nothing happens.

I've tried all the solutions: disabling Protected View, reinstalling, unchecking revocation verification, switching from PKCS#7 to CAdES, etc., but nothing works. I've tried it in another version of Adobe Acrobat Pro and in Acrobat Reader with the same results, so I think it may be related to the certificate, but it works correctly in three other different applications.

Additionally, I discovered that if I click "More" on either of these two options, Adobe crashes.

But I don't think it's related to the signature issue, since I can click them on another machine with Acrobat Pro installed.

Any ideas? Thanks.

creative explorer · Accepted Answer

@it_2016 Adobe Acrobat rely on your operating system's (macOS/Windows) certificate store to access digital IDs. If the certificate doesn't appear when you try to sign, it's often a configuration or access issue. But before you do that, make sure you have the latest update to Acrobat. Help > Updates.

You can try to resolve the certificate accessibility issues, by attempting to re-import the certificate directly within Adobe Acrobat. Start by navigating to the application's preferences: go to Acrobat Pro > Preferences (or Edit > Preferences on Windows). Next, select the Signatures category. Under the "Identities & Trusted Certificates" section, click More... In the subsequent window, review the Digital IDs list to check if your certificate is present. If it is missing, locate the Add ID or Import option to explicitly import the certificate, either directly from the file or from your operating system's store, such as the macOS Keychain. Crucially, ensure that the certificate file is in an easily readable format for Acrobat, such as PKCS#12 (.pfx or .p12).

If by chance the Digital ID isn't set up correctly, you may need to use Acrobat's tool to create a new Digital ID and select the certificate from your system store. This links the system certificate to an Acrobat signing profile.

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